/*******************************************************************************
 * Copyright (c) 2005, 2017 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 *******************************************************************************/
package org.eclipse.dltk.core.mixin;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.dltk.compiler.ISourceElementRequestor;
import org.eclipse.dltk.core.IModelElement;
import org.eclipse.dltk.core.IParent;
import org.eclipse.dltk.core.ISourceModule;
import org.eclipse.dltk.core.ModelException;

public class MixinSourceElementRequestor implements ISourceElementRequestor {
	private List<String> path = new ArrayList<>();
	private IMixinRequestor requestor;
	private boolean signature = false;
	private ISourceModule module;

	public MixinSourceElementRequestor(IMixinRequestor requestor,
			boolean signature, ISourceModule module) {
		this.requestor = requestor;
		this.signature = signature;
		this.module = module;
	}

	protected void enterElement(String path) {
		this.path.add(path);
	}

	private IModelElement getElement(IModelElement parent, int index) {
		if (path.size() == index) {
			return parent;
		}
		if (parent instanceof IParent) {
			IParent par = (IParent) parent;
			IModelElement[] children = null;
			try {
				children = par.getChildren();
			} catch (ModelException e) {
				e.printStackTrace();
				throw new RuntimeException(e);
			}
			for (int i = 0; i < children.length; ++i) {
				if (children[i].getElementName().equals(path.get(index))) {
					IModelElement el = getElement(children[i], index + 1);
					if (el != null) {
						return el;
					}
				}
			}
		}
		return null;
	}

	protected IModelElement getModelElement() {
		if (!signature) {
			return null;
		}
		if (this.path.size() == 0) {
			return this.module;
		}
		return getElement(this.module, 0);
	}

	protected void exitElement() {
		if (path.size() > 0) {
			this.path.remove(this.path.size() - 1);
		}
	}

	protected String getKey() {
		StringBuffer buffer = new StringBuffer();
		for (int i = 0; i < path.size(); ++i) {
			buffer.append(path.get(i));
			if (i != path.size() - 1) {
				buffer.append(IMixinRequestor.MIXIN_NAME_SEPARATOR);
			}
		}
		return buffer.toString();
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void acceptFieldReference(String fieldName, int sourcePosition) {
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void acceptMethodReference(String methodName, int argCount,
			int sourcePosition, int sourceEndPosition) {
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void acceptPackage(int declarationStart, int declarationEnd,
			String name) {
	}

	@Override
	public void acceptTypeReference(String typeName, int sourcePosition) {
	}

	/**
	 * @since 2.0
	 */
	@Override
	public boolean enterFieldCheckDuplicates(FieldInfo info) {
		return false;
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void enterMethodRemoveSame(MethodInfo info) {
	}

	@Override
	public void enterModule() {
	}

	@Override
	public void enterModuleRoot() {
	}

	@Override
	public boolean enterTypeAppend(String fullName, String delimiter) {
		return false;
	}

	@Override
	public void exitModule(int declarationEnd) {
	}

	@Override
	public void exitModuleRoot() {
	}

	@Override
	public void exitField(int declarationEnd) {
		exitElement();
	}

	@Override
	public void exitMethod(int declarationEnd) {
		exitElement();
	}

	@Override
	public void exitType(int declarationEnd) {
		exitElement();
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void enterField(FieldInfo info) {
		enterElement(info.name);
		IMixinRequestor.ElementInfo elInfo = new IMixinRequestor.ElementInfo();
		elInfo.key = getKey();
		if (signature) {
			elInfo.object = getModelElement();
		}
		requestor.reportElement(elInfo);
	}

	public void updateField(FieldInfo fieldInfo, int flags) {
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void enterMethod(MethodInfo info) {
		enterElement(info.name);
		IMixinRequestor.ElementInfo elInfo = new IMixinRequestor.ElementInfo();
		elInfo.key = getKey();
		if (signature) {
			elInfo.object = getModelElement();
		}
		requestor.reportElement(elInfo);
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void enterType(TypeInfo info) {
		enterElement(info.name);
		IMixinRequestor.ElementInfo elInfo = new IMixinRequestor.ElementInfo();
		elInfo.key = getKey();
		if (signature) {
			elInfo.object = getModelElement();
		}
		requestor.reportElement(elInfo);
	}

	/**
	 * @since 2.0
	 */
	@Override
	public void acceptImport(ImportInfo importInfo) {
	}

	@Override
	public void enterNamespace(String[] namespace) {
		// TODO Auto-generated method stub
	}

	@Override
	public void exitNamespace() {
		// TODO Auto-generated method stub
	}
}